Linked Questions

2
votes
2answers
8k views

How to create DEM from Lidar point cloud data? [duplicate]

I'm using ArcMap and I want to create DEM(s) over an area to have different outputs depending on which settings/filters I put in. I have access to laser point cloud data as my input files. I've worked ...
3
votes
1answer
3k views

Converting LAS file to .asc DSM? [duplicate]

I want to count trees in SAGA GIS and I am trying to follow the steps described in Counting trees using segmentation and vectorization in SAGA Gis from dominoc925.blogspot.com (05th, March, 2012). ...
0
votes
1answer
803 views

Gridding a LiDAR point cloud? [duplicate]

I have been trying to grid a point cloud, version1.2, LiDAR datasets which are intended to be used for hydraulic simulation of flood propagation. Already, I have used Arc* to work on the traditional (....
1
vote
0answers
37 views

Production of DEM on ArcMap from LiDAR data? [duplicate]

I am trying to produce a DEM for my dissertation (i'm relatively new to ArcGIS) so that I can conduct hydrological analyses of catchments. I have downloaded LIDAR (.laz 2x2 km) data and have created a ...
100
votes
6answers
161k views

Differences between DEM, DSM and DTM?

I am listing some of the acronyms used in our work and had to stop to think about whether to list these together or separately: DEM: Digital Elevation Model DSM: Digital Surface Model DTM: Digital ...
17
votes
7answers
38k views

Viewing LIDAR data (.las) in QGIS?

Is there an easy path to visualizing LIDAR data in QGIS? I have some USGS LIDAR data in .las format downloaded from http://lidar.cr.usgs.gov/. This means I have both the .las and metadata in .xml ...
10
votes
4answers
7k views

Determining bare earth DEM from unclassified LAS file?

I have data in LAS format with RGB values created from aerial photogrammetry using a UAV. I am trying to find a solution to extract the bare earth DEM from the point cloud. I have tried SAGA, ...
13
votes
3answers
5k views

Benefits of *.las vs *.xyz or *.ascii when working with LiDAR in ArcGIS for Desktop?

From time to time, we use LiDAR data for modelling in ArcGIS. Previously, we would be supplied either an .xyz or .ascii of the data, but more recently, we are also being provided .las files in ...
35
votes
2answers
16k views

Proper workflow for LAS to DEM conversion

I regularly come across LiDAR (.LAS) files with elevation data. When I do, I always struggle to find a way of converting them to a DEM for hydrological analysis. I have developed several workflows, ...
10
votes
1answer
5k views

Raster vs Grid vs Lattice terminology?

I have a question about GIS terminology - what is the difference between grid and raster and grid and lattice - in theory?? I thought, that raster is regular network and value is in the cell and the ...
2
votes
2answers
3k views

LAS dataset to raster with ground points only [duplicate]

I'm trying to make a raster from an LAS dataset. I want to only use points classified as ground, but I can't figure out how to do this. What I've tried is: Create LAS dataset from 2 .las files. ...
2
votes
2answers
2k views

Converting LiDAR data (.laz) to DSM in .asc format

I'm looking to convert a LIDAR scan in .laz format into a DSM in ASCII Grid format, in order to calculate RF propagation in an urban environment from a given transmission location (bonus: converting ...
2
votes
1answer
2k views

Merging multiple LiDAR (.las) files?

I downloaded about 9 LiDAR scenes from USGS and I want to use ArcGIS to merge them so that I can carry out tasks on them together as opposed to one by one.
2
votes
3answers
602 views

Creating DEM from multiple .las files using LAStools in ArcMap?

I am attempting to create a DEM for a raster large dataset, with over 500 .las files. Within the las2dem tool, within the LAStools toolbox there is not an option to select an entire folder, nor can ...
3
votes
1answer
791 views

Specifying LAS dataset filters in ArcGIS ModelBuilder?

I'm trying to create a tool in the ArcMap ModelBuilder to extract a canopy height raster from LiDAR data. I need to create rasters for ground elevation and first return. I've got my LAS dataset, and ...

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